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Open AccessArticle

Multi-Addressed Fiber Bragg Structures for Microwave-Photonic Sensor Systems

1
Department of Radiophotonics and Microwave Technologies, Kazan National Research Technical University named after A.N. Tupolev-KAI, 10, Karl Marx st., 420111 Kazan, Tatarstan, Russia
2
Department of Special Mathematics, Kazan National Research Technical University named after A.N. Tupolev-KAI, 10, Karl Marx st., 420111 Kazan, Tatarstan, Russia
3
Engineering Center “Computer Modeling and Engineering in the Field of Energy and Power Engineering”, Kazan State Power Engineering University, 51, Krasnoselskaya st., 420066 Kazan, Tatarstan, Russia
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(9), 2693; https://doi.org/10.3390/s20092693
Received: 21 April 2020 / Revised: 5 May 2020 / Accepted: 7 May 2020 / Published: 9 May 2020
(This article belongs to the Special Issue Fiber Bragg Grating Based Sensors and Systems)
The new theory and technique of Multi-Addressed Fiber Bragg Structure (MAFBS) usage in Microwave Photonics Sensor Systems (MPSS) is presented. This theory is the logical evolution of the theory of Addressed Fiber Bragg Structure (AFBS) usage as sensors in MPSS. The mathematical model of additive response from a single MAFBS is presented. The MAFBS is a special type of Fiber Bragg Gratings (FBG), the reflection spectrum of which has three (or more) narrow notches. The frequencies of narrow notches are located in the infrared range of electromagnetic spectrum, while differences between them are located in the microwave frequency range. All cross-differences between optical frequencies of single MAFBS are called the address frequencies set. When the additive optical response from a single MAFBS, passed through an optic filter with an oblique amplitude–frequency characteristic, is received on a photodetector, the complex electrical signal, which consists of all cross-frequency beatings of all optical frequencies, which are included in this optical signal, is taken at its output. This complex electrical signal at the photodetector’s output contains enough information to determine the central frequency shift of the MAFBS. The method of address frequencies analysis with the microwave-photonic measuring conversion method, which allows us to define the central frequency shift of a single MAFBS, is discussed in the work. View Full-Text
Keywords: microwave-photonic sensor systems; Fiber Bragg Gratings; Addressed Fiber Bragg Structures; Multi-Addressed Fiber Bragg Structures microwave-photonic sensor systems; Fiber Bragg Gratings; Addressed Fiber Bragg Structures; Multi-Addressed Fiber Bragg Structures
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Morozov, O.; Sakhabutdinov, A.; Anfinogentov, V.; Misbakhov, R.; Kuznetsov, A.; Agliullin, T. Multi-Addressed Fiber Bragg Structures for Microwave-Photonic Sensor Systems. Sensors 2020, 20, 2693.

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